Initial revision
diff --git a/progs/samples/fog.c b/progs/samples/fog.c
new file mode 100644
index 0000000..96534dd
--- /dev/null
+++ b/progs/samples/fog.c
@@ -0,0 +1,311 @@
+/*
+ * Copyright (c) 1991, 1992, 1993 Silicon Graphics, Inc.
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and
+ * its documentation for any purpose is hereby granted without fee, provided
+ * that (i) the above copyright notices and this permission notice appear in
+ * all copies of the software and related documentation, and (ii) the name of
+ * Silicon Graphics may not be used in any advertising or
+ * publicity relating to the software without the specific, prior written
+ * permission of Silicon Graphics.
+ *
+ * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF
+ * ANY KIND,
+ * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
+ * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * IN NO EVENT SHALL SILICON GRAPHICS BE LIABLE FOR
+ * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
+ * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+ * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
+ * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+ * OF THIS SOFTWARE.
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <GL/glut.h>
+
+GLenum rgb, doubleBuffer;
+
+#include "tkmap.c"
+
+double plane[4] = {
+ 1.0, 0.0, -1.0, 0.0
+};
+float rotX = 5.0, rotY = -5.0, zTranslate = -65.0;
+float fogDensity = 0.02;
+GLint cubeList = 1;
+
+float scp[18][3] = {
+ {
+ 1.000000, 0.000000, 0.000000
+ },
+ {
+ 1.000000, 0.000000, 5.000000
+ },
+ {
+ 0.707107, 0.707107, 0.000000
+ },
+ {
+ 0.707107, 0.707107, 5.000000
+ },
+ {
+ 0.000000, 1.000000, 0.000000
+ },
+ {
+ 0.000000, 1.000000, 5.000000
+ },
+ {
+ -0.707107, 0.707107, 0.000000
+ },
+ {
+ -0.707107, 0.707107, 5.000000
+ },
+ {
+ -1.000000, 0.000000, 0.000000
+ },
+ {
+ -1.000000, 0.000000, 5.000000
+ },
+ {
+ -0.707107, -0.707107, 0.000000
+ },
+ {
+ -0.707107, -0.707107, 5.000000
+ },
+ {
+ 0.000000, -1.000000, 0.000000
+ },
+ {
+ 0.000000, -1.000000, 5.000000
+ },
+ {
+ 0.707107, -0.707107, 0.000000
+ },
+ {
+ 0.707107, -0.707107, 5.000000
+ },
+ {
+ 1.000000, 0.000000, 0.000000
+ },
+ {
+ 1.000000, 0.000000, 5.000000
+ },
+};
+
+
+static void Build_lists(void)
+{
+
+ glNewList(cubeList, GL_COMPILE);
+ glBegin(GL_TRIANGLE_STRIP);
+ glNormal3fv(scp[0]); glVertex3fv(scp[0]);
+ glNormal3fv(scp[0]); glVertex3fv(scp[1]);
+ glNormal3fv(scp[2]); glVertex3fv(scp[2]);
+ glNormal3fv(scp[2]); glVertex3fv(scp[3]);
+ glNormal3fv(scp[4]); glVertex3fv(scp[4]);
+ glNormal3fv(scp[4]); glVertex3fv(scp[5]);
+ glNormal3fv(scp[6]); glVertex3fv(scp[6]);
+ glNormal3fv(scp[6]); glVertex3fv(scp[7]);
+ glNormal3fv(scp[8]); glVertex3fv(scp[8]);
+ glNormal3fv(scp[8]); glVertex3fv(scp[9]);
+ glNormal3fv(scp[10]); glVertex3fv(scp[10]);
+ glNormal3fv(scp[10]); glVertex3fv(scp[11]);
+ glNormal3fv(scp[12]); glVertex3fv(scp[12]);
+ glNormal3fv(scp[12]); glVertex3fv(scp[13]);
+ glNormal3fv(scp[14]); glVertex3fv(scp[14]);
+ glNormal3fv(scp[14]); glVertex3fv(scp[15]);
+ glNormal3fv(scp[16]); glVertex3fv(scp[16]);
+ glNormal3fv(scp[16]); glVertex3fv(scp[17]);
+ glEnd();
+ glEndList();
+}
+
+static void Init(void)
+{
+ static float ambient[] = {0.1, 0.1, 0.1, 1.0};
+ static float diffuse[] = {1.0, 1.0, 1.0, 1.0};
+ static float position[] = {90.0, 90.0, 0.0, 0.0};
+ static float front_mat_shininess[] = {30.0};
+ static float front_mat_specular[] = {0.0, 0.0, 0.0, 1.0};
+ static float front_mat_diffuse[] = {0.0, 1.0, 0.0, 1.0};
+ static float back_mat_shininess[] = {50.0};
+ static float back_mat_specular[] = {0.0, 0.0, 1.0, 1.0};
+ static float back_mat_diffuse[] = {1.0, 0.0, 0.0, 1.0};
+ static float lmodel_ambient[] = {0.0, 0.0, 0.0, 1.0};
+ static float fog_color[] = {0.8, 0.8, 0.8, 1.0};
+
+ glFrontFace(GL_CW);
+
+ glEnable(GL_DEPTH_TEST);
+
+ glLightfv(GL_LIGHT0, GL_AMBIENT, ambient);
+ glLightfv(GL_LIGHT0, GL_DIFFUSE, diffuse);
+ glLightfv(GL_LIGHT0, GL_POSITION, position);
+ glLightModelfv(GL_LIGHT_MODEL_AMBIENT, lmodel_ambient);
+ glLightModeli(GL_LIGHT_MODEL_TWO_SIDE, GL_TRUE);
+ glEnable(GL_LIGHTING);
+ glEnable(GL_LIGHT0);
+
+ glMaterialfv(GL_FRONT, GL_SHININESS, front_mat_shininess);
+ glMaterialfv(GL_FRONT, GL_SPECULAR, front_mat_specular);
+ glMaterialfv(GL_FRONT, GL_DIFFUSE, front_mat_diffuse);
+ glMaterialfv(GL_BACK, GL_SHININESS, back_mat_shininess);
+ glMaterialfv(GL_BACK, GL_SPECULAR, back_mat_specular);
+ glMaterialfv(GL_BACK, GL_DIFFUSE, back_mat_diffuse);
+
+ glEnable(GL_FOG);
+ glFogi(GL_FOG_MODE, GL_EXP);
+ glFogf(GL_FOG_DENSITY, fogDensity);
+ if (rgb) {
+ glFogfv(GL_FOG_COLOR, fog_color);
+ glClearColor(0.8, 0.8, 0.8, 1.0);
+ } else {
+ glFogi(GL_FOG_INDEX, 1<<5);
+ SetFogRamp(5, 3);
+ glClearIndex(128);
+ }
+
+ Build_lists();
+}
+
+static void Reshape(int width, int height)
+{
+
+ glViewport(0, 0, (GLint)width, (GLint)height);
+
+ glMatrixMode(GL_PROJECTION);
+ glLoadIdentity();
+ gluPerspective(45.0, 1.0, 1.0, 200.0);
+ glMatrixMode(GL_MODELVIEW);
+}
+
+static void Key2(int key, int x, int y)
+{
+
+ switch (key) {
+ case GLUT_KEY_UP:
+ rotX -= 5;
+ break;
+ case GLUT_KEY_DOWN:
+ rotX += 5;
+ break;
+ case GLUT_KEY_LEFT:
+ rotY -= 5;
+ break;
+ case GLUT_KEY_RIGHT:
+ rotY += 5;
+ break;
+ default:
+ return;
+ }
+
+ glutPostRedisplay();
+}
+
+static void Key(unsigned char key, int x, int y)
+{
+
+ switch (key) {
+ case 27:
+ exit(1);
+ case 'D':
+ if (rgb) {
+ fogDensity *= 1.10;
+ glFogf(GL_FOG_DENSITY, fogDensity);
+ }
+ break;
+ case 'd':
+ if (rgb) {
+ fogDensity /= 1.10;
+ glFogf(GL_FOG_DENSITY, fogDensity);
+ }
+ break;
+ default:
+ return;
+ }
+
+ glutPostRedisplay();
+}
+
+static void Draw(void)
+{
+
+ glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
+
+ glPushMatrix();
+
+ glTranslatef(0, 0, zTranslate);
+ glRotatef(rotY, 0,1,0);
+ glRotatef(rotX, 1,0,0);
+ glScalef(1.0, 1.0, 10.0);
+
+ glCallList(cubeList);
+
+ glPopMatrix();
+
+ glFlush();
+
+ if (doubleBuffer) {
+ glutSwapBuffers();
+ }
+}
+
+static GLenum Args(int argc, char **argv)
+{
+ GLint i;
+
+ rgb = GL_TRUE;
+ doubleBuffer = GL_FALSE;
+
+ for (i = 1; i < argc; i++) {
+ if (strcmp(argv[i], "-ci") == 0) {
+ rgb = GL_FALSE;
+ } else if (strcmp(argv[i], "-rgb") == 0) {
+ rgb = GL_TRUE;
+ } else if (strcmp(argv[i], "-sb") == 0) {
+ doubleBuffer = GL_FALSE;
+ } else if (strcmp(argv[i], "-db") == 0) {
+ doubleBuffer = GL_TRUE;
+ } else {
+ printf("%s (Bad option).\n", argv[i]);
+ return GL_FALSE;
+ }
+ }
+ return GL_TRUE;
+}
+
+int main(int argc, char **argv)
+{
+ GLenum type;
+
+ glutInit(&argc, argv);
+
+ if (Args(argc, argv) == GL_FALSE) {
+ exit(1);
+ }
+
+ glutInitWindowPosition(0, 0); glutInitWindowSize( 300, 300);
+
+ type = GLUT_DEPTH;
+ type |= (rgb) ? GLUT_RGB : GLUT_INDEX;
+ type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
+ glutInitDisplayMode(type);
+
+ if (glutCreateWindow("Fog Test") == GL_FALSE) {
+ exit(1);
+ }
+
+ InitMap();
+
+ Init();
+
+ glutReshapeFunc(Reshape);
+ glutKeyboardFunc(Key);
+ glutSpecialFunc(Key2);
+ glutDisplayFunc(Draw);
+ glutMainLoop();
+ return 0;
+}